<template>
  <div class="login_container">
    <div class="login_container_counter">
      <img src="../assets/logo.png" alt="">
      <!--    登录表单-->
      <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRoules" label-width="0px" class="login_form">
        <el-form-item prop="username">
          <el-input v-model="loginForm.username" placeholder="用户名" prefix-icon="iconfont icon-user"></el-input>
        </el-form-item>
        <el-form-item prop="password">
          <el-input v-model="loginForm.password" placeholder="密码" type="password" prefix-icon="iconfont icon-3702mima"></el-input>
        </el-form-item>
        <!--按钮区域-->
        <el-form-item class="btns">
            <el-button type="primary"  @click="login">登录</el-button>
            <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data() {
      return {
       //这是登录表单的数据对象
       loginForm:{
           username:'',
           password:''
       },
       loginFormRoules:{
           username:[
              { required: true, message: '请输入用户名', trigger: 'blur' },
              { min: 3, max: 18, message: '长度在 3 到 18 个字符', trigger: 'blur' },
           ],
           password:[
               { required: true, message: '请输入密码', trigger: 'blur' },
               { min: 3, max: 18, message: '长度在 3 到 18 个字符', trigger: 'blur' }
           ]
       }
      }
    },
    methods:{
        //点击重置按钮，重置登录表单
        resetLoginForm(){
            /* console.log(this) */
            this.$refs.loginFormRef.resetFields();
        },
        login(){
            this.$refs.loginFormRef.validate(async valid =>{
                if(!valid)return;
                const {data:res} = await this.$http.post('login',this.loginForm)
                console.log(this.loginForm)
                if(res.meta.status != 200)return this.$message.error("登录失败");
                this.$message.success("登录成功");
                // 1. 将登录成功之后的 token，保存到客户端的 sessionStorage 中
                //   1.1 项目中除了登录之外的其他API接口，必须在登录之后才能访问
                //   1.2 token 只应在当前网站打开期间生效，所以将 token 保存在 sessionStorage 中
                // console.log(res.data.token)
                window.sessionStorage.setItem('token',res.data.token)
                // 2. 通过编程式导航跳转到后台主页，路由地址是 /home
                this.$router.push('/home')
            });
        }
    }
}
</script>

<style lang="less" scoped>
.login_container {
  background-color: #2a4a6a;
  height: 100%;

  .login_container_counter {
    height: 300px;
    width: 500px;
    position: relative;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border-radius: 20px;
    background-color: white;

    img {
      width: 100px;
      height: 100px;
      border: 8px solid white;
      border-radius: 50%;
      box-shadow: 0 0 10px white;
      position: absolute;
      left: 50%;
      transform: translate(-50%, -50%);
      background-color: #f7f7f9;
    }
  }
  .login_form{
      position: absolute;
      bottom: 0;
      width: 100%;
      padding: 0 20px;
      box-sizing: border-box;
  }
}

.btns{
    display: flex;
    justify-content: flex-end;
}

</style>
